The invention relates to a data backup method and device and computer equipment. The method comprises the steps that a data backup instruction sent by a user terminal is received, wherein the data backup instruction comprises application program identification; if it is detected that preset application program identification exists in the application program identification, to-be-backuped data is obtained according to the preset application program identification, and an encryption method which is sent by the user terminal and corresponds to the preset application program identification is obtained; encryption is conducted on the to-be-backuped data corresponding to the preset application program identification according to the encryption method, and the encrypted to-be-backuped data is backuped. According to the data backup method and device and the computer equipment, the phenomenon that the to-be-backuped data is exposed in the backup process can be prevented, and the security of the data is improved.